Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf742e24a0c3b1b…

MALICIOUS

PDF

15.1 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 052269d6ce72c2eb19a059db41d76315 SHA-1: e12b699fc355e1bc7162eac9532441cfeea81faa SHA-256: 4cf742e24a0c3b1b12c4cb7ed70884de4345ccc81a67a141f8f8472c59964e67
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The file was identified as malicious by multiple engines, including ClamAV which classified it as Pdf.Dropper.Agent-7212284-0. The presence of embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics, suggests that the PDF is designed to execute code. ClamAV also detected a malicious artifact extracted from the PDF, identified as Win.Trojan.Agent-36166. The primary attack pattern involves the use of JavaScript to download and execute a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7212284-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7212284-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
0d4419a64508d3263127591e7b27be9404c55257ee7581a57926430005d4b2e6		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 84214 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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